How long can the EcoFlow DELTA Pro 3 run a Well pump (1 hp)?
23.2 hours
Formula: (4.1kWh × 0.85 inverter efficiency) ÷ 3.6 kWh/day = 23.2 hours. At continuous 1500 W draw (no duty cycle), about 2.3 hours.
What if you add a battery? The + Extra Battery config jumps to 8.2kWh — roughly 1.9 days on a Well pump (1 hp).
Appliance
Well pump (1 hp) · 1500 W / 4500 W surge · 240V
Battery (base)
4.1kWh · 4kW / 8kW surge
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Runtime Quick-Check
Runtime Quick-Check
Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.
23.2 hours
Formula: (4096 Wh × 0.85) ÷ 3.6 kWh/day = 23.2 hours. Continuous draw ≈ 2.3 hours at full load.
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